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FAIR VALUE MEASUREMENTS (Tables) | 12 Months Ended
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Dec. 31, 2013
FAIR VALUE MEASUREMENTS |
Schedule of cash equivalents, restricted cash and marketable securities by security type | Cash equivalents, restricted cash and marketable securities by security type at December 31, 2013 were as follows:
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
|  | (In thousands) |
Included in cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 8,079 |  | $ | — |  | $ | — |  | $ | 8,079 |
Corporate notes |  |  | 2,206 |  |  | — |  |  | — |  |  | 2,206 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | $ | 10,285 |  | $ | — |  | $ | — |  | $ | 10,285 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Restricted cash: |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  | $ | 795 |  | $ | — |  | $ | — |  | $ | 795 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Marketable securities (due in less than 1 year): |  |  |  |  |  |  |  |  |  |  |  |  |
Government-sponsored enterprise securities |  | $ | 7,369 |  | $ | 1 |  | $ | (1 | ) | $ | 7,369 |
Commercial paper |  |  | 5,496 |  |  | 3 |  |  | — |  |  | 5,499 |
Corporate notes |  |  | 39,383 |  |  | 1 |  |  | (18 | ) |  | 39,366 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | $ | 52,248 |  | $ | 5 |  | $ | (19 | ) | $ | 52,234 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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Cash equivalents, restricted cash and marketable securities by security type at December 31, 2012 were as follows:
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
|  | (In thousands) |
Included in cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 15,660 |  | $ | — |  | $ | — |  | $ | 15,660 |
Corporate notes |  |  | 3,136 |  |  | — |  |  | (1 | ) |  | 3,135 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | $ | 18,796 |  | $ | — |  | $ | (1 | ) | $ | 18,795 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Restricted cash: |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  | $ | 794 |  | $ | — |  | $ | — |  | $ | 794 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Marketable securities (due in less than 1 year): |  |  |  |  |  |  |  |  |  |  |  |  |
Government-sponsored enterprise securities |  | $ | 8,618 |  | $ | 5 |  | $ | — |  | $ | 8,623 |
Commercial paper |  |  | 20,623 |  |  | 21 |  |  | — |  |  | 20,644 |
Corporate notes |  |  | 44,190 |  |  | 22 |  |  | (7 | ) |  | 44,205 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | $ | 73,431 |  | $ | 48 |  | $ | (7 | ) | $ | 73,472 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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Schedule of cash equivalents and marketable securities with unrealized losses | Cash equivalents and marketable securities with unrealized losses at December 31, 2013 and 2012 were as follows:
|  | Less Than 12 Months |  | 12 Months or Greater |  | Total |
--- | --- | --- | --- | --- | --- | --- | ---
|  | Estimated Fair Value |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Gross Unrealized Losses |
|  | (In thousands) |
As of December 31, 2013: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government-sponsored enterprise securities (due in less than 1 year) |  | $ | 3,947 |  | $ | (1 | ) | $ | — |  | $ | — |  | $ | 3,947 |  | $ | (1 | )
Corporate notes (due in less than 1 year) |  |  | 37,060 |  |  | (18 | ) |  |  |  |  |  |  |  | 37,060 |  |  | (18 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | $ | 41,007 |  | $ | (19 | ) | $ | — |  | $ | — |  | $ | 41,007 |  | $ | (19 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
As of December 31, 2012: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate notes (due in less than 1 year) |  | $ | 27,045 |  | $ | (8 | ) | $ | — |  | $ | — |  | $ | 27,045 |  | $ | (8 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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Schedule of non-employee options to purchase common stock considered as derivatives and classified as current liabilities |
|  |  |  | Number of Shares at December 31, |  |  |  |  |  | Fair Value at December 31, |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
|  | Exercise Price |  | Exercisable Date |  | Expiration Date |
Issuance Date |  | 2013 |  | 2012 |  | 2013 |  | 2012 |
|  |  |  |  |  |  |  |  |  |  |  | (In thousands) |
March 2005 |  | $ | 6.39 |  |  | 284,600 |  |  | 284,600 |  | January 2007 |  | March 2015 |  | $ | 367 |  | $ | 51 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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Schedule of assumptions used to estimate the fair value of derivatives | The fair value of derivatives has been calculated at each reporting date using the Black Scholes option-pricing model with the following assumptions:
|  | December 31,
--- | --- | ---
|  | 2013 |  | 2012
Dividend yield |  | None |  | None
Expected volatility |  | 0.844 |  | 0.828
Risk-free interest rate |  | 0.13% |  | 0.25%
Expected term |  | 1 yr |  | 2 yrs
Schedule of financial instruments measured at fair value on recurring basis | The following table presents information about our financial instruments that are measured at fair value on a recurring basis as of December 31, 2013 and indicates the fair value category assigned.
|  | Fair Value Measurements at Reporting Date Using |
--- | --- | --- | ---
|  | Quoted Prices in Active Markets for Identical Assets/ Liabilities |  | Significant Other Observable Inputs |  | Significant Unobservable Inputs |  |  |
(In thousands) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds(1) |  | $ | 8,079 |  | $ | — |  | $ | — |  | $ | 8,079 |
Government-sponsored enterprise securities(2) |  |  | — |  |  | 7,369 |  |  | — |  |  | 7,369 |
Commercial paper(2) |  |  | — |  |  | 5,499 |  |  | — |  |  | 5,499 |
Corporate notes(1)(2) |  |  | — |  |  | 41,572 |  |  | — |  |  | 41,572 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total |  | $ | 8,079 |  | $ | 54,440 |  | $ | — |  | $ | 62,519 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives(3) |  | $ | — |  | $ | — |  | $ | 367 |  | $ | 367 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
The following table presents information about our financial instruments that are measured at fair value on a recurring basis as of December 31, 2012 and indicates the fair value category assigned.
|  | Fair Value Measurements at Reporting Date Using |
--- | --- | --- | ---
|  | Quoted Prices in Active Markets for Identical Assets/ Liabilities |  | Significant Other Observable Inputs |  | Significant Unobservable Inputs |  |  |
(In thousands) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds(1) |  | $ | 15,660 |  | $ | — |  | $ | — |  | $ | 15,660 |
Government-sponsored enterprise securities(2) |  |  | — |  |  | 8,623 |  |  | — |  |  | 8,623 |
Commercial paper(2) |  |  | — |  |  | 20,644 |  |  | — |  |  | 20,644 |
Corporate notes(1)(2) |  |  | — |  |  | 47,340 |  |  | — |  |  | 47,340 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total |  | $ | 15,660 |  | $ | 76,607 |  | $ | — |  | $ | 92,267 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives(3) |  | $ | — |  | $ | — |  | $ | 51 |  | $ | 51 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(1) Included in cash and cash equivalents on our consolidated balance sheets. (2) Included in current marketable securities on our consolidated balance sheets. (3) Included in fair value of derivatives on our consolidated balance sheets.
Schedule of rollforward of the balance sheet amounts for financial instruments in Level 3 category |
|  | Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Year Ended December 31, 2013 |
--- | --- | --- | ---
(In thousands) |  | Fair Value at December 31, 2012 |  | Total Unrealized Loss Included in Earnings(1) |  | Purchases, Sales, Issuances, Settlements |  | Transfers In and/or Out of Level 3 |  | Fair Value at December 31, 2013 |  | Change in Unrealized Loss Related to Financial Instruments Held at December 31, 2013(1) |
Derivative liabilities |  | $ | 51 |  | $ | 316 |  | $ | — |  | $ | — |  | $ | 367 |  | $ | 316 |
(1) Reported as unrealized loss on derivatives in our consolidated statements of operations.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13476-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 + Details
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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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